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As described within the area "information service and utility brokers" in Chapter 2, "Oracle Solaris Cluster: aspects and architecture," Oracle has a substantial listing of supported brokers that cowl many of the purposes for your records middle. These utility agents are maintained by using Oracle and are notably demonstrated on each new free up of each the Solaris Cluster application and the application itself. having said that, inevitably you could have an application that is not a part of the latest agent portfolio.utility Suitability
earlier than creating a resource type in your software, you must examine whether the software meets the criteria for being made highly purchasable. right here checklist highlights the main points you should agree with. For an entire list see "analyzing the utility for Suitability" in [SCDevGuide].
upon getting decided that your utility is suitable for being made extremely available, you have a few the right way to achieve the necessary integration:
each choice is discussed in additional aspect in right here sections.widespread statistics provider
The prevalent information provider (GDS) is equipped with the Solaris Cluster software. The SUNW.gds agent is packaged within the SUNWscgds package, which is installed as ordinary by means of the Solaris Cluster application installer software. The SUNW.gds agent is regarded the preferred approach to create both failover and scalable substances. The GDS is supported by Oracle, but you ought to help the script that you simply deliver for the Start_command, Stop_command, Probe_command, and Validate_command strategies.
through default, the SUNW.gds aid classification isn't registered, so that you have to register it earlier than attempting to create a useful resource of that type. The commands in right here example reveal a way to check if the useful resource type is registered and then the way to register it, whether it is now not already present.illustration four.13. Registering the SUNW.gds resource class
Use the clresourcetype command to examine whether the SUNW.gds useful resource type must be registered.# clresourcetype listing | grep SUNW.gds # clresourcetype register SUNW.gds # clresourcetype checklist | grep SUNW.gds SUNW.gds:6
besides the standard resource homes, the GDS agent has four houses to allow you to combine your software: Start_command, Stop_command, Probe_command, and Validate_command. These residences are described in "Integrating Your utility-specific logic." by using the GDS as the foundation to your utility, you immediately benefit from all of the patches and have improvements that the GDS receives.
illustration 4.14 shows tips on how to use the GDS to make the X11 program xeyes totally accessible. You begin through making a Start_command program. in this illustration, a script calls the whole route name of the software with a parameter it truly is passed to the shell script. This script should exist on all of the cluster nodes on which the utility is supposed to run.
next, having checked that the SUNW.gds aid category is registered, you create the useful resource community. in this example, you permit the aid community's node listing to default to all of the cluster nodes.
subsequent, you create a resource to characterize your program. in the illustration, the Start_command property is certain with the aid of the script you wrote (and which should exist on all nodes). The display parameter to use is also exact. as a result of this software does not hear on any community ports, you place the network_aware property to false. This ability that the probe mechanism used could be the persevered existence of the xeyes process that the Start_command software leaves running within the heritage. via default, any resource you create is enabled so that when the aid community is brought online, the useful resource is immediately began. To alternate the default, you can specify the -d argument to the clresource create command.
The final two steps teach the RGM that it should handle or manage the xeyes-rg useful resource community and then to convey that resource community on-line. The action of bringing the resource neighborhood online begins the useful resource since it became created in an enabled state.
Assuming you have allowed far off X11 valued clientele to display in your X server the usage of xhost and you have distinctive the correct X reveal to make use of (exchange a price appropriate to your atmosphere for myhost:1.0), then the xeyes software will seem on your reveal. which you can switch the resource neighborhood between nodes and the RGM will kill the xeyes system and restart it on the new node, phys-summer2, as the example shows.example 4.14. developing a simple, enormously purchasable xeyes carrier
listing the script that may be used to delivery the xeyes command.# cat /tmp/start_xeyes #!/bin/ksh /usr/openwin/demo/xeyes -display $1 & exit 0
verify that the SUNW.gds aid category is registered, and then create the aid neighborhood and useful resource as a way to handle the xeyes service.# clresourcetype record | grep SUNW.gds SUNW.gds:6 # clresourcegroup create xeyes-rg # clresource create -t SUNW.gds > -p start_command="/tmp/start_xeyes myhost:1.0" > -p network_aware=false > -g xeyes-rg xeyes-rs
Use the clresourcegroup command to convey the xeyes-rg resource group online.# clresourcegroup manage xeyes-rg # clresourcegroup on-line xeyes-rg # clresourcegroup repute xeyes-rg === Cluster aid groups === community identify Node identify Suspended fame ---------- --------- --------- ------ xeyes-rg phys-summer1 No online phys-summer2 No Offline # clresourcegroup swap -n phys-summer2 xeyes-rg # clresourcegroup reputation xeyes-rg === Cluster useful resource organizations === group name Node identify Suspended popularity ---------- --------- --------- ------ xeyes-rg phys-summer1 No Offline phys-summer2 No online
To exhibit how the GDS handles application failure, stop the xeyes application out of your X screen. you are going to notice that the RGM restarts the software basically straight away. The messages in /var/adm/messages (see illustration 4.15) point out that the RGM diagnosed the failure and restarted the service.
After the fault probe determines that the service is online, indicated via provider is on-line in /var/adm/messages, kill the method again. The aid has two homes that verify how many times it's restarted by means of the RGM inside a undeniable time length. These properties are Retry_count and Retry_interval (see example 4.16). After the distinct variety of screw ups, the developed-in common sense of the GDS determines that the latest node is unhealthy and releases the service so that it will also be all started on another node. If the service also experiences issues on this node, then the RGM will now not fail the provider lower back to its long-established node until the time period, in seconds, as defined by way of the resource neighborhood's Pingpong_interval property, has passed. instead, the GDS attempts to maintain the provider working on the ultimate node. This behavior is ruled by means of one more property referred to as Failover_mode.
The aim of the Pingpong_interval property is to keep away from a provider that fails to start from perpetually looping, resulting within the service migrating from side to side between cluster nodes. In a check ambiance, you could should reset the value of Pingpong_interval to a lessen value. Doing so allows for you to restart your service after getting corrected any problems you encountered.instance 4.15. pattern RGM Messages
The /var/adm/messages file consists of information on the state alterations of the aid businesses and elements in the cluster.Nov 23 04:00:23 phys-summer2 Cluster.RGM.world.rgmd: [ID 529407 daemon.notice] useful resource neighborhood xeyes-rg state on node phys-summer2 trade to RG_ONLINE Nov 23 04:01:23 phys-summer2 Cluster.RGM.international.rgmd: [ID 922363 daemon.notice] useful resource xeyes-rs fame msg on node phys-summer2 trade to <provider is on-line.> Nov 23 04:01:25 phys-summer2 Cluster.PMF.pmfd: [ID 887656 daemon.notice] system: tag="xeyes-rg,xeyes-rs,0.svc", cmd="/bin/sh -c /tmp/start_xeyes myhost:1.0", Failed to dwell up. Nov 23 04:01:25 phys-summer2 Cluster.RGM.international.rgmd: [ID 784560 daemon.notice] useful resource xeyes-rs status on node phys-summer2 alternate to R_FM_FAULTED Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 922363 daemon.notice] aid xeyes-rs fame msg on node phys-summer2 alternate to <provider daemon no longer operating.> Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 423137 daemon.error] A resource restart attempt on resource xeyes-rs in useful resource neighborhood xeyes-rg has been blocked because the number of restarts within the previous Retry_ interval (370 seconds) would exceed Retry_count (2) Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 874133 daemon.notice] Issuing a failover request since the utility exited. Nov 23 04:01:25 phys-summer2 Cluster.RGM.international.rgmd: [ID 494478 daemon.notice] resource xeyes-rs in useful resource neighborhood xeyes-rg has requested failover of the aid group on phys-summer2. Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 423291 daemon.error] RGM is never failing aid group <xeyes-rg> off of node <phys-summer2>, as a result of there are no different present or competencies masters Nov 23 04:01:25 phys-summer2 Cluster.RGM.global.rgmd: [ID 702911 daemon.error] aid <xeyes-rs> of aid neighborhood <xeyes-rg> failed pingpong investigate on node <phys- summer1>. The aid community aren't mastered by means of that node. Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 969827 daemon.error] Failover attempt has failed. Nov 23 04:01:25 phys-summer2 SC[,SUNW.gds:6,xeyes-rg,xeyes-rs,gds_probe]: [ID 670283 daemon.notice] Issuing a resource restart request since the utility exited. instance 4.16. Retry, Failover Mode, and Ping-pong Interval properties
Use the clresource command to verify the property values of the xeyes-rs resource.# clresource reveal > -p retry_count,retry_interval,failover_mode xeyes-rs === substances === aid: xeyes-rs --- normal and extension properties --- Retry_interval: 370 class: common Description: Time by which computer screen attempts to restart a failed resource Retry_count instances. class: int Retry_count: 2 type: general Description: shows the number of instances a computer screen restarts the resource if it fails. category: int Failover_mode: soft type: usual Description: Modifies restoration movements taken when the resource fails. class: enum # clresourcegroup exhibit -p pingpong_interval xeyes-rg === aid groups and materials === useful resource neighborhood: xeyes-rg Pingpong_interval: 3600
in the previous example, the monitor variable property can be modified only via stopping the aid and editing the Start_command property. however of little significance right here, since the xeyes program have to be restarted to alternate the goal X server on which it displays, it does make a change in instances the place a variable can be modified while a carrier is running. Examples encompass changing debugging tiers to use and changing directories for log data.
To create a useful resource classification that has new extension residences that can be modified should you need to alternate them, you should both write your useful resource category from scratch or create a subclass of the GDS, as described in a later area.helping New applications the use of the advanced Agent Toolkit
Many utility brokers in the existing Solaris Cluster utility unencumber are derived from the superior Agent Toolkit methodology [AdvGDSTlkit]: HA-PostgreSQL, HA-MySQL, and HA containers, to identify three. All three use the SUNW.gds agent as their groundwork. however, in its raw form, the SUNW.gds agent has some barriers.
The motive at the back of the toolkit is that each one new software brokers have many average requirements:
The toolkit additionally simplifies plenty of the work vital to handle Oracle Solaris Zones and SMF. as a consequence, presenting this prolonged framework makes it possible for your developers to center of attention on the application-particular integration work instead of on debugging the framework itself. After the work is finished, the new resource category is registered the usage of a registration script.developing useful resource forms with the aid of making a Subclass of the GDS
The expertise of creating a subclass of the GDS, in place of writing a brand new useful resource category from scratch, is that the new useful resource classification inherits the entire most beneficial practices which are already part of the usual GDS code. additionally, creating a subclass of the GDS permits you to create your personal useful resource classification extension houses whereas maintaining the identical stage of flexibility as in case you had started from scratch. at last, your new resource classification, which is a subclass of the GDS, has a definite name, enabling you to effectively distinguish components of the brand new useful resource type. in case you as an alternative used the advanced Agent Toolkit or the SUNW.gds agent, then you would need to examine what the aid is through examining the extension homes or reviewing the code. This step would be critical since the aid classification can be set to SUNW.gds, in preference to MYCORP.appsvr, for example.
You create a subclass of the GDS with the aid of making a resource type registration (RTR) file where the RT_basedir parameter is set to the directory containing binaries used with the aid of the normal GDS strategies: delivery, cease, Validate, and so forth. then you definitely lengthen the RTR file by using defining your own aid class extension properties. finally, you put the components parameters in the RTR file to factor to your scripts that override the typical GDS habits.
a couple of present sun aid varieties are implemented this way, together with the HA-Logical area agent (SUNW.ldom), which become covered in the area "Failover guest Domains" in Chapter 3, "Combining Virtualization technologies with Oracle Solaris Cluster software."
The RTR file for the SUNW.ldom aid category is proven in instance four.17. during this RTR file, the RT_basedir parameter is set to the general listing for the GDS kit, that is, /opt/SUNWscgds/bin. Of the general strategies, simplest Init, Boot, and Validate had been overridden the use of classes that can be found within the ../../SUNWscxvm/bin directory. unlike a common GDS aid class, the Start_command, Stop_command, Probe_command, and Validate_command properties are assigned fastened values and can't be modified. here's indicated by the Tunable = NONE settings. furthermore, each command, apart from validate_command, is referred to as with a constant set of arguments, namely, -R %RS_NAME -T %RT_NAME -G %RG_NAME. The %variable assemble is corresponding to the $variable syntax found in shell scripts. It means that after a useful resource of this type is instantiated, use the names you assigned it as arguments. as an example, in case you wrote a resource category referred to as FOO.bar and then created a aid group known as whizz-rg containing a resource referred to as bang-rs of this class, the argument passed can be -R bang-rs -T FOO.bar -G whizz-rg. With these arguments, which you can then make calls to the RMAPI or DSDL APIs to retrieve or set homes.
In contrast to the Start_command, Stop_command, and Probe_command houses, the Validate_command property doesn't use this assemble. as a substitute, the RGM passes the validate command all of the properties listed for the useful resource category on the command line. Then the validate command parses this list and determines whether the configuration is valid.instance 4.17. RTR File for the SUNW.ldom resource classification
right here textual content suggests one of the vital key materials of the RTR file for the SUNW.ldom useful resource type:. . . RESOURCE_TYPE = "ldom"; VENDOR_ID = SUNW; RT_DESCRIPTION = "sun Cluster HA for xVM Server SPARC guest Domains"; RT_version ="1"; API_version = 10; RT_basedir=/decide/SUNWscgds/bin; Init = ../../SUNWscxvm/bin/init_xvm; Boot = ../../SUNWscxvm/bin/boot_xvm; beginning = gds_svc_start; cease = gds_svc_stop; Validate = ../../SUNWscxvm/bin/validate_xvm; update = gds_update; Monitor_start = gds_monitor_start; Monitor_stop = gds_monitor_stop; Monitor_check = gds_monitor_check; Init_nodes = RG_PRIMARIES; Failover = FALSE; # The paramtable is a listing of bracketed resource property declarations # that come after the aid-category declarations # The property-identify announcement need to be the first attribute # after the open curly of a paramtable entry # # here are the gadget described homes. each of the gadget defined # properties have a default cost set for each of the attributes. examine # man rt_reg(four) for a detailed clarification. # PROPERTY = Start_timeout; MIN = 60; DEFAULT = 300; PROPERTY = Stop_timeout; MIN = 60; DEFAULT = 300; . . . # here is an optional property. Any value provided can be used as # absolutely the path to a command to invoke to validate the application. # If no cost is equipped, The validation can be skipped. # PROPERTY = Validate_command; EXTENSION; STRING; DEFAULT = ""; TUNABLE = NONE; DESCRIPTION = "Command to validate the utility"; # This property should be particular, on the grounds that this is the most effective mechanism # that shows how to delivery the utility. seeing that a worth should # be offered, there is not any default. The price need to be an absolute course. PROPERTY = Start_command; EXTENSION; STRINGARRAY; DEFAULT = "/decide/SUNWscxvm/bin/control_xvm beginning -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to start utility"; # this is an not obligatory property. Any cost offered should be used as # absolutely the path to a command to invoke to stop the application. # If no price is supplied, signals could be used to cease the application. # # It is thought that Stop_command will no longer return until the # application has been stopped. PROPERTY = Stop_command; EXTENSION; STRING; DEFAULT = "/choose/SUNWscxvm/bin/control_xvm cease -R %RS_NAME -T %RT_NAME -G %RG_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to cease application"; # here's an not obligatory property. Any value supplied can be used as # the absolute route to a command to invoke to probe the software. # If no value is equipped, the "simple_probe" can be used to probe # the utility. # PROPERTY = Probe_command; EXTENSION; STRING; DEFAULT = "/decide/SUNWscxvm/bin/control_xvm probe -R %RS_NAME -G %RG_NAME -T %RT_NAME"; TUNABLE = NONE; DESCRIPTION = "Command to probe utility"; # here's an optional property. It determines whether the utility # makes use of community to communicate with its purchasers. # PROPERTY = Network_aware; EXTENSION; BOOLEAN; DEFAULT = FALSE; TUNABLE = AT_CREATION; DESCRIPTION = "Determines whether the application makes use of community"; # this is an not obligatory property, which determines the signal sent to the # application for being stopped. # PROPERTY = Stop_signal; EXTENSION; INT; MIN = 1; MAX = 37; DEFAULT = 15; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The sign despatched to the application for being stopped"; # this is an optional property, which determines even if to failover when # retry_count is handed throughout retry_interval. # PROPERTY = Failover_enabled; EXTENSION; BOOLEAN; DEFAULT = true; TUNABLE = WHEN_DISABLED; DESCRIPTION = "Determines whether to failover when retry_count is handed all over retry_interval"; # this is an optional property that specifies the log stage GDS movements. # PROPERTY = Log_level; EXTENSION; ENUM NONE, info, ERR ; DEFAULT = "info"; TUNABLE = every time; DESCRIPTION = "Determines the log stage for event based mostly traces"; Property = Debug_level; Extension; Per_node; Int; Min = 0; Max = 2; Default = 0; Tunable = each time; Description = "Debug stage"; Property = Domain_name; Extension; String; Minlength = 1; Tunable = WHEN_DISABLED; Description = "LDoms guest domain name"; Property = Migration_type; Extension; Enum common, MIGRATE ; Default = "MIGRATE"; Tunable = each time; Description = "category of visitor domain migration to be carried out"; PROPERTY = Plugin_probe; EXTENSION; STRING; DEFAULT = ""; TUNABLE = every time; DESCRIPTION = "Script or command to verify the guest domain"; PROPERTY = Password_file; EXTENSION; STRING; DEFAULT = ""; TUNABLE = WHEN_DISABLED; DESCRIPTION = "The complete route to the file containing the target host password"; scdsbuilder GUI
To personalize an agent past what is accredited through the GDS, which you can use the Agent Builder command, scdsbuilder (see the scdsbuilder(1HA) man page). This command has three code technology alternate options, and the ensuing files are wrapped in a Solaris kit so you might installation to your cluster nodes:
that you may customise the resulting code to your certain needs. however, with the ksh registration script for the GDS agent, the scope for modification is restricted. The instance in determine four.7 suggests the use of the third alternative.
figure 4.7 the use of the scdsbuilder GUI to create a new useful resource type
The scdsbuilder command starts the Solaris Cluster Agent Builder GUI, as shown in figure 4.7. in this instance, records has already been detailed for every box accessible to the person. a brief code of SUNW is unique for the supplier identify, and tstgds is distinct for the software identify. This facts is then used to generate both the identify of the kit that Agent Builder creates for you and the identify of the useful resource classification that you're going to because of this use.
The tips you supply within the different fields is used as follows:
once you have entered the information and clicked on the next button, you're introduced with the monitor shown in determine four.8.
determine 4.eight finishing the resource type definition the usage of scdsbuilderIntegrating Your utility-specific common sense
you employ the fields in this 2nd screen to give the area of the classes (which can be compiled executables or scripts) and their linked arguments that should be used to delivery, cease, probe, and validate your facts service when it's put in on the goal cluster nodes. For every application, you can set a deadline on how lengthy it could take for the application to finished. If the program does not comprehensive within the allocated time duration, then the aid is positioned right into a failed state, reminiscent of STOP_FAILED.
you are required to provide a worth most effective for the birth application. all of the different programs are not obligatory. Any classes specific must exit with a return code of zero best when they've effectively completed their work. in the event that they fail to operate their disbursed project, they need to return a worth stronger than 100. Values beneath which are used by means of the Solaris Cluster commands and have selected meanings (see the intro(1CL) man page).
The programs you assign to the start and stop instructions ought to return efficiently handiest when your goal software has definitely achieved the relevant operation. If the stop command leaves the software under its control running, or no longer fully stopped, however the stop command returns correctly, then the cluster framework erroneously determines that it is safe to delivery the resource neighborhood on one other cluster node. In some circumstances, mainly when the software uses a global file equipment, this influence could influence in statistics corruption because the two cases of the software might write to their data files in an uncontrolled vogue.
If no cease command is provided, the method tree that consequences from the birth command is terminated the use of the kill command.
The validate command enables you to examine that your application is correctly configured on all of the potential nodes on which it could actually run. once again, if the program determines that your application is misconfigured, the validate program have to exit with a nonzero exit code.
The means to comprise a probe command is likely one of the key advantages of the usage of the Solaris Cluster framework. A probe command allows you to jot down a software that determines the fitness of your software. for example, when you are writing a probe for a database, you may verify even if it may possibly execute fundamental SQL statements, equivalent to developing or deleting a desk, or adding or deleting a listing. in case you do not give a probe script, then default methods are used as an alternative.
For non-community-conscious purposes, the system-monitoring command pmfadm (see the pmfadm(1M) man page) displays the system tree spawned through your delivery command. handiest if all of the procedures have failed will the cluster framework try to restart the carrier. therefore, in case your service includes distinct strategies and only one method fails, then pmfadm will no longer admire this fault unless it factors the entire other procedures to fail as smartly. due to this fact, in case you deserve to computer screen your utility with a stronger diploma of granularity, you ought to give a custom fault probe.
If the software is network-mindful, then the default probe tries to open the port listed in the port_list property. because here's a simple probe, it makes no attempt to retrieve any statistics. however the default probe efficiently opens the ports, that doesn't necessarily indicate average application health.
within the preceding instance, you would install the kit generated by means of scdsbuilder on your whole cluster nodes. you may then register the brand new useful resource category so that you could create new materials of this type. When the RGM is requested to create a useful resource, it calls the validate command: /usr/local/bin/my_validate -o some_param. If that command succeeds and you enable the resource, the RGM calls the /usr/native/bin/my_start -r foo-rs -g bar-rg command. In each circumstances, the initial arguments are fastened, however which you can modify them as a result the usage of the clresource command.useful resource classification Registration File
if you decide to write down an agent from scratch using either the RMAPI or DSDL APIs, you have to first describe the houses of your proposed resource category in a file accepted as the aid class registration (RTR) file. This file gives the RGM with particulars on which programs to name and which variables are required to manage the selected software.
instance four.18 shows an extract from the SUNW.LogicalHostname RTR file. because the illustration shows, all of the courses for this aid type are located within the directory defined by RT_BASEDIR. The RTR file additionally defines classes with the intention to, among different tasks, start, cease, and probe (Monitor_start) the logical IP address that the aid plumbs. These addresses are, in turn, defined in the HostnameList property.
The extension houses you define are all application-specific. They may, for example, confer with the region of the application binaries, it truly is, the utility domestic listing. If a property has a default value, then you could define it in the RTR file to retailer your equipment administrator from having to override it every time she or he creates a aid of this category. additionally, that you could location limits on what values definite houses can take and after they will also be changed.illustration four.18. Extract from the SUNW.LogicalHostname RTR File
right here textual content suggests one of the crucial key constituents of the RTR file for the SUNW.LogicalHostname aid type:# # Copyright 1998-2008 sun Microsystems, Inc. All rights reserved. # Use is field to license terms. # #ident "@(#)SUNW.LogicalHostname 1.20 08/05/20 SMI" # Registration assistance and Paramtable for HA Failover IPaddress # # note: key words are case insensitive, i.e. users may also use any # capitalization style they want # RESOURCE_TYPE ="LogicalHostname"; VENDOR_ID = SUNW; RT_DESCRIPTION = "Logical Hostname aid type"; SYSDEFINED_TYPE = LOGICAL_HOSTNAME; RT_VERSION ="three"; API_VERSION = 2; INIT_NODES = RG_PRIMARIES; RT_BASEDIR=/usr/cluster/lib/rgm/rt/hafoip; FAILOVER = real; # To permit Global_zone_override GLOBAL_ZONE = real; delivery = hafoip_start; stop = hafoip_stop; PRENET_START = hafoip_prenet_start; VALIDATE = hafoip_validate; update = hafoip_update; MONITOR_START = hafoip_monitor_start; MONITOR_STOP = hafoip_monitor_stop; MONITOR_CHECK = hafoip_monitor_check; PKGLIST = SUNWscu; # # upgrade directives # #$improve #$upgrade_from "1.0" each time #$upgrade_from "2" every time # The paramtable is a list of bracketed resource property declarations # that come after the resource-type declarations # The property-name declaration ought to be the primary attribute # after the open curly of a paramtable entry # # The Paramtable can't contain TIMEOUT homes for methods # that are not within the RT PROPERTY = Start_timeout; MIN=360; DEFAULT=500; . . . # HostnameList: list of hostnames managed by means of this useful resource. All have to be # on the identical subnet. If want > 1 subnet with a RG, create as many # components as there are subnets. PROPERTY = HostnameList; EXTENSION; STRINGARRAY; TUNABLE = AT_CREATION; DESCRIPTION = "record of hostnames this resource manages"; . . . aid management API
The aid management API (RMAPI) is a collection of low-level capabilities contained in the libscha.so library with both C and shell interfaces. the entire feature names offered by this interface are prefixed with scha_. The shell interfaces are listed in section 1HA of the Solaris Cluster manual pages.
The ksh scripts generated by using the Agent Builder are built the usage of these instructions, so that you can insert further traces during this code the place the feedback point out. however, for stronger handle over the good judgment imposed on your utility you have to write your application agent from scratch.facts carrier construction Library
The facts service development Library (DSDL) is a collection of bigger-degree features encapsulated in the libdsdev.so library that builds on the RMAPI performance. This library can best be accessed the use of a c language interface. due to this fact, it's probably more time-consuming to put in writing an entire application agent using this strategy, although it does present the optimum stage of performance and flexibility.
if you used Agent Builder to create a resource type, which you could personalize it by way of inserting added DSDL code where the feedback point out. in any other case, you must write your agent from scratch.
the entire characteristic names offered via the library are prefixed with scds_ and are documented in part 3HA of the Solaris Cluster guide pages. The NFS agent source code [NFSAgent] serves as a superb example of how these APIs are used. the usage of the nfs_svc_start.c supply as a specific instance, the library is initialized with scds_initialize(). aid and useful resource neighborhood names are then retrieved the usage of scds_get_resource_name() and scds_get_resource_group_name() calls, respectively. finally, the fame of the aid is determined with the aid of the RMAPI scha_resource_setstatus() call. many of the coding effort concerned with the usage of these interfaces is consumed by means of the logic that describes how the agent should still behave in a number of failure scenarios. as an instance, how many times should still the agent attempt to restart the service before giving up and doubtlessly failing over? What may still the agent do according to a network failure?
One abilities of the usage of the GDS is that the entire most appropriate practices for provider habits are already in the logic of the code that makes up the agent, saving you from re-growing that code.helpful Utilities for building customized statistics services
The Solaris Cluster utility comes with two classes that you will find very helpful in case you create your aid classification from scratch: hatimerun (see the hatimerun(1M) man web page) and pmfadm.hatimerun Command
right through the start, cease, Monitor_start, and Validate methods of your resource type, you're going to deserve to run a variety of classes to function the required common sense steps. as a result of your goal is excessive availability, you can not look ahead to a program that might under no circumstances respond or return, whether that program has gone into a loop or is unable to retrieve some vital data from the community, disk, or other software. due to this fact, you should area time constraints on the duration of the program's execution. here's the characteristic of the hatimerun command. It allows for you to execute a software below its control and set a limit on the time it might take to respond. If the application in query fails to respond in a well timed fashion, it is terminated through default.
The hatimerun command also makes it possible for you to leave the program running asynchronously in the background, alternate the exit code back after a timeout, or use a selected sign to terminate your program.
essentially the most usual utilization of this command is to your probe commands or in the steps main up to stopping or starting your application.pmfadm Command
if you write a customized probe to your service, you make a decision what constitutes a in shape carrier. The criteria could consist of utility-specific checks to determine if the statistics it's providing to potential shoppers is valid or well timed. If the utility contains distinct approaches, you could are looking to assess that each and every manner is running, the use of the ps command. All of those exams combine to give you the most efficient assessment of your utility's present health. however, your probe is scheduled to make its exams handiest at standard intervals. in spite of the fact that that you would be able to tune these checks to take place at shorter intervals, doing so outcomes in a greater load on your gadget. subsequently, you should wait, on common, half the probe period before your probe detects a condition the place your utility has completely failed, meaning that the entire approaches have exited. once once more, this does not aid a whole lot toward your purpose of high availability.
The solution is to use pmfadm, the system-monitoring facility command. if you start your application beneath pmfadm, it screens all of the strategies your software spawns to a degree that you investigate. by using default, it displays all of the utility's infant tactics. in the event that they all exit, pmfadm immediately restarts your application for you on the situation that it has not already passed a preset number of restarts inside a undeniable time interval.
probably the most normal utilization of this command is to your birth command to be sure that your key utility techniques are monitored and that comprehensive screw ups are reacted to instantly.libschost.so Library
Some functions save or make use of configuration advice concerning the physical hostname of the server on which the application is running. Such functions will obviously fail when the utility is placed in a resource neighborhood and moved between the nodes of a cluster. This failure occurs as a result of calls to uname or gethostbyname produce distinctive responses on the global zone of each and every cluster node. Oracle software Server and the Oracle E-enterprise Suite are two examples of courses that risk such failures [LibHost].
to beat this hindrance, you employ the LD_PRELOAD characteristic to permit the runtime linker to interpose the libschost.so.1 library in the dynamic linking method. right here instance shows how this is done. that you would be able to use the identical construct inside your aid delivery or Monitor_start (probe) methods, as required.instance 4.19. the way to Use the sclibhost.so.1 Library to trade the String returned as the Hostname
Use the uname command to monitor the present hostname.# uname -n phys-winter1
Set the LD_PRELOAD_32, LD_PRELOAD_64 and SC_LHOSTNAME ambiance variables, and then rerun the uname command.# LD_PRELOAD_32=$LD_PRELOAD_32:/usr/cluster/lib/libschost.so.1 # LD_PRELOAD_64=$LD_PRELOAD_64:/usr/cluster/lib/64/libschost.so.1 # SC_LHOSTNAME=myhost # export SC_LHOSTNAME LD_PRELOAD_32 LD_PRELOAD_64 # uname -n myhost
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